CLEVER DESIGN 3 x stages, 3 x materials, 3 x grinding methods No.1 diamond grinding rod for coarse grinding, No.2 solid tungsten steel disc for repair, No.3 special ceramic rod for fine grinding and polishing. A GREAT TOOLGrinding head is removable and practical. If you have the 3-stage knife sharpener from , you don't need another knife sharpener for kitchen knives, pocket knives, folding knives, hunting knives. Unfortunately, you cannot use the knife sharpener to sharpen scissors and knives with heavily wavy blades such as bread knives. ENVIRONMENTAL PROTECTION AND SAFETY Knife sharpener is made of excellent ABS material. With the ergonomic handle, your hands will protect from friction, your hands from being cut. Non-slip rubber base provides you with replaceable head and stable working surface. NOTEDo not use excessive and strong force, do not pull back and forth. The spice is in the product description.